New York magazine's Sept. 11 issue has arrived, and it's a real treat. The whole issue has been turned into an encyclopedia of Sept. 11-related entries, including everything from "freedom fries" to "Abbottabad," and many of them penned by wonderful writers. Mark Lilla's in there, as is Eliza Griswold. I haven't read them all, but one caught my eye in particular: Jim Holt's entry for "Humor."